Land reclamation and restoration device and method for land resource management

Abstract

The present invention discloses a land reclamation and repair device and method for land resource management, which relates to the field of soil remediation technology, and includes: an electrode plate, a flow channel is opened in the longitudinal direction of the contaminated area, and the electrode plate is arranged in the flow channel; a heating plate, a mounting groove is opened in the transverse direction of the contaminated area, and the heating plate is arranged in the mounting groove. The present invention adopts in-situ remediation of the contaminated area, opens flow channels and mounting grooves in the longitudinal and transverse directions in the contaminated area, and installs electrode plates and heating plates respectively. The electrode plates are used to form a DC electric field, and electrodialysis and electromigration are formed in the contaminated area. Charged ions or ligands migrate to the electrode plates with opposite electrical properties under the action of the external electric field, and the pore water in the soil flows from the anode plate to the cathode plate. The heating plate is used to heat the soil in the contaminated area, so that the internal pollutants volatilize and accelerate the migration speed. In the EK environment, the heating plate accelerates the migration speed, which greatly improves the repair speed of the contaminated area.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a land reclamation and remediation device and method for land resource management. Background Art

[0002] Currently, soil remediation can be divided into in-situ and ex-situ remediation. Ex-situ remediation has a relatively short remediation cycle and generally higher remediation efficiency, but it is not suitable for large areas where contaminated soil is located.

[0003] In-situ remediation typically uses chemical remediation techniques. First, the soil is broken up, and then a chemical remediation solution is sprayed onto the contaminated soil. This allows the solution to combine with the pollutants and convert them into less toxic substances. However, due to the varying depths of contamination in different soils, deeper soils are less likely to come into contact with the remediation solution, resulting in poor remediation results. Furthermore, chemical remediation techniques can leave residual remediation solutions, potentially causing secondary contamination of the soil.

[0004] Electrokinetic remediation (EK) is an emerging soil remediation technology that applies a DC electric field to promote the migration of pollutants in the soil, thereby achieving the purpose of remediation. However, EK technology is less efficient in treating soil pollution. 3 Under the conditions of 96 hours of continuous operation, the heavy metal content in the soil can be reduced by about 40% (reaching the standard of exhibition type II land (residual amount in the soil <600mg / kg)), so it has not yet been widely used.

[0005] Compared with chemical remediation technology, electrodynamic remediation technology is highly environmentally friendly and reliable. In view of this, how to provide a device that can accelerate the efficiency of electrodynamic remediation of soil is an urgent problem that needs to be solved by technical personnel in this field. Summary of the Invention

[0006] The purpose of the present invention is to provide a land reclamation and restoration device and method for land resource management to solve the problems existing in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention provides a land consolidation and restoration device for land resource management, comprising:

[0008] The electrode plate has a flow channel longitudinally opened in the contaminated area, and the electrode plate is arranged in the flow channel;

[0009] The heating plate has an installation groove opened in the contaminated area along the horizontal direction, and the heating plate is arranged in the installation groove.

[0010] Furthermore, it also includes a connecting assembly for connecting adjacent electrode plates and / or adjacent heating plates in a vertical direction.

[0011] Furthermore, the connection component includes:

[0012] A clamping member is integrally provided on the electrode plate and / or the heating plate along the length direction, and a clamping slot is provided at the bottom of the electrode plate and / or the heating plate, and the clamping member can be engaged with the clamping slot;

[0013] An integrated board, wherein a first electrical connector is provided on a side of the electrode plate and / or the heating plate, and a plurality of electrical connection holes are provided on the side of the integrated board, and when the first electrical connector is inserted into the electrical connection holes, the clamping member is connected to the integrated board;

[0014] The second electrical connector is provided on the integrated board and is used for connecting to a power supply.

[0015] Furthermore, it also includes:

[0016] a first electromagnet, disposed on a side of the electrode plate and / or the heating plate and spaced apart from the first electrical connector;

[0017] The second electromagnet is arranged on the side of the integrated board, the first electromagnet is connected to the first electrical connector, and the second electromagnet is connected to the second electrical connector. When the first electrical connector is inserted into the electrical connection hole, the first electromagnet and the second electromagnet are attracted to each other.

[0018] Furthermore, it also includes:

[0019] A trenching machine is provided with a trenching assembly capable of adjusting the trenching depth. The trenching machine is used for opening flow channels and installing grooves in polluted areas.

[0020] Furthermore, it also includes: a soil sampling mechanism, the soil sampling mechanism including:

[0021] A cylindrical collection tube, which is a cylindrical structure with a lower opening and a sawtooth structure on its lower edge. The cylindrical collection tube is provided with sampling holes on its inner and outer surfaces;

[0022] A rotating motor, wherein the output end of the rotating motor is fixedly connected to the top of the cylindrical collecting tube;

[0023] A cylinder is fixedly arranged on the outer side of the trencher, and an output end of the cylinder is fixedly connected to the rotating motor.

[0024] Furthermore, it also includes:

[0025] The storage chamber is integrally arranged on the trenching machine and is used to store the electrode plates, the heating plates, the power supply and the soil analyzer. The soil analyzer is used to confirm the contamination depth of the contaminated area based on the sample.

[0026] Furthermore, a pollution unit is defined between the flow channel and the mounting groove. The pollution unit is provided with air holes, which are connected to the water vapor pipe and input water vapor into the pollution unit.

[0027] The present invention also provides a land consolidation and restoration method for land resource management, comprising the following steps:

[0028] S1: Collect samples from the contaminated area through a soil sampling mechanism, divide the samples into multiple contaminated intervals along the depth direction of the contaminated area, and send the samples from multiple contaminated intervals into the soil analyzer in sequence to confirm the contamination depth of the contaminated area;

[0029] S2: Use a trencher to create flow channels and installation grooves in the contaminated area in the longitudinal and transverse directions. The depth of the flow channels and installation grooves corresponds to the depth of the contamination.

[0030] S3: Confirm the height of the electrode plate and heating plate according to the depth of the flow channel and the installation groove;

[0031] S4: The electrode plates include a cathode plate and an anode plate, which are arranged in different flow channels; the cathode plate is located between two adjacent anode plates and the anode plates are arranged in the two outermost flow channels; a heating plate is arranged in the mounting groove;

[0032] S3: A pollution unit is defined between the flow channel and the mounting groove, and an air hole is opened in the middle of the pollution unit. The depth of the air hole is 60%-70% of the pollution depth;

[0033] S4: The electrode plates and heating plates are energized, and 100-degree Celsius steam is simultaneously input into the pollution cell through the pores. A DC electric field is formed between the anode plate and the cathode plate, causing the charged pollutants in the pollution cell to accumulate on the anode plate or the cathode plate. The pore water in the pollution cell flows toward the cathode plate under the action of the DC electric field, and the uncharged pollutants in the pollution cell flow with the pore water into the flow channel where the cathode plate is located.

[0034] S5: After the soil remediation of the contaminated area is completed, the electrode plates and pore water in the flow channel are removed, and the charged pollutants accumulated on the anode plates and cathode plates and the uncharged pollutants in the pore water are centrally treated;

[0035] S6: Take out the heating plate, use clean soil to backfill the flow channel, installation groove and air hole, and centrally process the excavated soil generated by opening the flow channel, installation groove and air hole.

[0036] Furthermore, the distance between adjacent cathode plates and anode plates is 60cm-100cm, the voltage between the cathode plates and anode plates is 30-60V, and the current density is 5-8A / m 3 , the heating temperature of the heating plate is 120-150 degrees Celsius.

[0037] The present invention discloses the following technical effects:

[0038] 1. The present invention adopts in-situ remediation of contaminated areas. Flow channels and installation grooves are opened in the contaminated area in the vertical and horizontal directions, and electrode plates and heating plates are installed respectively. The electrode plates are used to form a DC electric field, forming electrodialysis and electromigration in the contaminated area. Charged ions or ligands migrate toward the electrode plates with opposite electrical properties under the action of the external electric field. The pore water in the soil flows from the anode plate to the cathode plate, and the pollutants that migrate with the pore water are enriched near the cathode plate. The heating plate is used to heat the soil in the contaminated area, causing the internal pollutants to volatilize and accelerate the migration speed. In the EK environment, the heating plate accelerates the migration speed, which greatly improves the repair speed of the contaminated area.

[0039] 2. This combined technology not only has a good remediation effect on heavy metal-contaminated soil, but can also remove inorganic salts and organic matter pollution in the soil. This means that the combination of EK and heating plate technology can handle a wider range of pollutant types and more complex pollution situations.

[0040] 3. No chemical repair agents are added during the entire EK and heating plate repair process, which helps avoid the risk of secondary contamination and reduces chemical costs during the repair process. Compared with other existing methods, the EK and heating plate combined technology has low energy consumption and cost.

[0041] 4. Based on the EK and heating plate, this application introduces 100-degree Celsius water vapor into the contaminated area. On the one hand, water vapor helps maintain the temperature of the contaminated area and diffuses outward from the center of the contaminated area to form pores, further accelerating the volatilization and migration of pollutants; on the other hand, part of the water vapor condenses and settles in the soil in the contaminated area during the diffusion process, which helps maintain soil moisture and accelerate the electrodialysis rate, thereby increasing the repair speed of the contaminated area. This combined repair solution can reduce the repair time of the contaminated area to within 24 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 Schematic diagram of the contaminated area;

[0044] Figure 2 It is a schematic diagram of the heating plate integration;

[0045] Figure 3 Schematic diagram of the heating plate;

[0046] Figure 4 It is the schematic diagram of the integrated board;

[0047] Figure 5 It is a schematic diagram of the integration of two adjacent heating plates;

[0048] Figure 6 This is a schematic diagram of a trenching machine;

[0049] Figure 7 Schematic diagram of the sampling mechanism;

[0050] Among them, 1. contaminated area; 2. flow channel; 3. mounting groove; 4. cathode plate; 5. anode plate; 6. heating plate; 7. clamping part; 8. clamping slot; 9. integrated board; 10. first electrical connector; 11. second electrical connector; 12. electrical connection hole; 13. first electromagnet; 14. second electromagnet; 15. trencher; 16. cylindrical collecting tube; 17. rotating motor; 18. cylinder; 19. storage chamber; 20. air hole. DETAILED DESCRIPTION

[0051] Electrokinetic remediation (EK) uses an electric field to induce soil contaminants to migrate near electrodes. This technology inserts a cathode and an anode into the soil and applies a DC electric field, causing charged contaminants (such as heavy metal ions and charged organic molecules) to migrate under the action of the electric field. Through this action, contaminants in the soil are moved near the electrodes, achieving centralized treatment.

[0052] Studies have shown that when EK technology is used alone, the removal efficiency of certain pollutants (such as pentachlorophenol PCP) is low. For example, it is difficult to remove PCP from soil using EK technology alone. Studies have shown that combining electrokinetic remediation technology with permeable reaction walls (PRBs) can effectively remediate soils contaminated by heavy metals such as chromium (Cr) and arsenic (As). For example, in a study by Zhang et al., EK-PRB remediation of Cr(VI)-contaminated soil was performed using calcined hydrotalcite as a filler material. The results showed that this combined remediation system has a good remediation effect on both lightly and heavily contaminated soils, but its remediation efficiency is low and its energy consumption is high. Additional buffers or enhancers (solubilizers, chelating agents, etc.) need to be added to enhance the remediation effect.

[0053] However, even if additional buffer or additives are added, the remediation efficiency is still very low. According to a study, when the remediation voltage is 30V and the remediation time is 96 hours, the Pb content in the soil is 2The removal rate of chlorinated parasites reached 40.83%, and the residual amount in the soil was 595 mg / kg, which basically met the standard for Class II exhibition sites (residual amount in the soil <600 mg / kg). In other words, it would take at least 96 hours to meet the basic requirements for soil remediation.

[0054] In summary, while EK technology has some applications in soil remediation, its efficiency and energy consumption issues limit its widespread adoption. When dealing with large contaminated soil sites, the most common approach is still physical fragmentation combined with chemical remediation for in-situ remediation.

[0055] The embodiments of the present invention are intended to provide a highly efficient, low-energy EK soil remediation solution. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Example

[0058] An embodiment of the present invention provides a land reclamation and restoration device for land resource management, including: an electrode plate, a flow channel 2 is longitudinally opened in the contaminated area 1, and the electrode plate is arranged in the flow channel 2; a heating plate 6, an installation groove 3 is transversely opened in the contaminated area 1, and the heating plate 6 is arranged in the installation groove 3.

[0059] In this embodiment, a connecting assembly is further included for vertically connecting adjacent electrode plates and adjacent heating plates 6. The electrode plates and heating plates 6 are connected by a snap-fit ​​method, and the sizes of the electrode plates and heating plates 6 are set to be small. The overall working depth of the electrode plates and heating plates 6 can be adjusted by adjusting the number of electrode plates and heating plates 6 used.

[0060] In this embodiment, the connection assembly includes: a clip 7, which is integrally arranged on the electrode plate and the heating plate 6 along the length direction, and a slot 8 is provided at the bottom of the electrode plate and the heating plate 6, and the clip 7 can be engaged with the slot 8; an integrated board 9, a first electrical connector 10 is provided on the side of the electrode plate and the heating plate 6, and a plurality of electrical connection holes 12 are provided on the side of the integrated board 9. When the first electrical connector 10 is inserted into the electrical connection hole 12, the clip 7 is connected to the integrated board 9; a second electrical connector 11 is provided on the integrated board 9 for connecting to a power supply.

[0061] In this embodiment, the electrode plate and the heating plate 6 are basically the same in the clamping structure. Taking the heating plate 6 as an example, the clamping member 7 is T-shaped and is integrally arranged on the top of the heating plate 6. The card slot 8 is T-shaped and is arranged at the bottom of the heating plate 6. When two upper and lower adjacent heating plates 6 are clamped, the upper heating plate 6 clamps the card slot 8 on the clamping member 7 from left to right. After clamping, the outer side surfaces of the two upper and lower adjacent heating plates 6 are tightly fitted and located in the same vertical plane. At the top heating plate 6, there is a certain gap between the T-shaped clamping member 7 and the body of the heating plate 6, but this place is close to the ground surface and has little effect on the overall heating effect. The first electrical connector 10 of each heating plate 6 is located on the same side, and the integrated board 9 is provided with a plurality of electrical connection holes 12 corresponding to each first electrical connector 10.

[0062] In this embodiment, it also includes: a first electromagnet 13, which is arranged on the side of the electrode plate and the heating plate 6 and is spaced apart from the first electrical connector 10; a second electromagnet 14, which is arranged on the side of the integrated board 9, the first electromagnet 13 is connected to the first electrical connector 10, and the second electromagnet 14 is connected to the second electrical connector 11. When the first electrical connector 10 is inserted into the electrical connection hole 12, the first electromagnet 13 and the second electromagnet 14 are attracted to each other. The first electromagnet 13 and the second electromagnet 14 are not magnetic under the condition of no power. Therefore, when the second electrical connector 11 is powered off, the electrode plate and the heating plate 6 can be easily separated from the integrated board 9, which can improve the convenience of disassembly and assembly. In some other embodiments, the first electromagnet 13 or the second electromagnet 14 can also be replaced with a metal sheet, and the electrode plate, the heating plate 6 and the integrated board 9 can be fixed by the electromagnet adsorbing the metal sheet. The purpose of setting two electromagnets is to improve the adsorption effect and increase the structural stability after multiple electrode plates or heating plates 6 are spliced ​​together.

[0063] This embodiment also includes a trencher 15 having a trenching assembly capable of adjusting the trenching depth. The trenching assembly and the drive structure of trencher 15 are conventional and will not be described in detail here. Trencher 15 is used to create a flow channel 2 and a mounting groove 3 in contaminated area 1. The trenching assembly's operating depth is adjusted according to the depth of the flow channel 2 and the mounting groove 3.

[0064] This embodiment also includes a soil sampling mechanism, comprising a cylindrical collection tube 16. This cylindrical collection tube 16 is a cylindrical structure with a lower opening and a serrated lower edge. The serrations facilitate rapid insertion of the cylindrical collection tube 16 into the soil. Sampling holes are defined throughout the inner and outer surfaces of the cylindrical collection tube 16. The output end of a rotating motor 17 is fixedly connected to the top of the cylindrical collection tube 16. A cylinder 18 is fixedly mounted on the outer side of the trencher 15, and the output end of the cylinder 18 is fixedly connected to the rotating motor 17. The sampling holes are used to remove the sample from the cylindrical collection tube 16 after sampling. In this embodiment, the outer surface of the cylindrical collection tube 16 can be scaled to simply divide the sample into contamination zones. Sampling can be performed directly according to the contamination zones, simplifying the sampling process and allowing for partial sampling while the remaining samples are processed centrally.

[0065] This embodiment also includes a storage chamber 19, integrally mounted on the trenching machine 15 (the trenching assembly maintains a power connection structure with the trenching machine 15, which can be located inside or outside the storage chamber 19 and does not affect the normal operation of the trenching assembly). This chamber is used to store the electrode plates, heating plate 6, power supply, and a soil analyzer, which is used to determine the contamination depth of the contaminated area 1 based on samples. The integrated storage of the various components used for soil remediation on the trenching machine 15 facilitates their transport to the contaminated area 1, eliminating the need for additional transportation vehicles.

[0066] In this embodiment, a rectangular pollution unit distributed in a matrix is ​​defined between the flow channel 2 and the mounting groove 3. An air hole 20 is opened at the center of the pollution unit. The air hole 20 is connected to the water vapor pipe and inputs 100 degrees Celsius water vapor into the pollution unit.

[0067] The land reclamation and restoration method is described in detail below in conjunction with the above-mentioned restoration device, including the following steps:

[0068] S1: Collect samples in the polluted area 1 through a soil sampling agency, and divide the samples into multiple pollution intervals along the depth direction of the polluted area 1. The depths of the multiple pollution intervals are the same. For example, the sampling depth is one meter, and the pollution interval is set to 5 cm, for a total of 20. The samples of the multiple pollution intervals are sent to the soil analyzer in turn to analyze the soil pollution conditions of each pollution interval and confirm the pollution depth of the polluted area 1. For example, the pollution of 10 pollution intervals below the surface is more serious, and the pollution of the 11th pollution interval below the surface meets the soil use standards, then the pollution depth is confirmed to be 0.5m.

[0069] S2: A flow channel 2 and a mounting groove 3 are respectively opened in the contaminated area 1 in the longitudinal and transverse directions by a trenching machine 15; the depths of the flow channel 2 and the mounting groove 3 correspond to the depth of contamination, and the heating plate 6 and the electrode plate have the same thickness. In this way, the trenching machine 15 can complete the trenching work of the flow channel 2 and the mounting groove 3 by using the same trenching assembly; the spacing between adjacent flow channels 2 is 60 cm, the spacing between adjacent heating plates 6 is also 60 cm, and the depths of the flow channel 2 and the mounting groove 3 correspond to the depth of contamination.

[0070] S3: Determine the height of the electrode plate and the heating plate 6 according to the depth of the flow channel 2 and the installation groove 3, and splice the electrode plate and the heating plate 6 of the corresponding height.

[0071] S4: The electrode plate includes a cathode plate 4 and an anode plate 5, which are arranged in different flow channels 2; the cathode plate 4 is located between two adjacent anode plates 5 and the anode plate 5 is arranged in the two outermost flow channels 2, and the heating plate 6 is arranged in the mounting groove 3; in this way, a cathode plate 4 is provided between any two adjacent anode plates 5, and a cathode plate 4 can form two DC electric fields on the left and right sides, and can also concentrate the pore water in the soil from both sides to the middle cathode plate 4, so as to facilitate the centralized treatment of the pore water in the later stage.

[0072] S3: A contamination unit is defined between the flow channel 2 and the mounting groove 3. An air hole 20 is provided in the middle of the contamination unit. The air hole 20 can be directly opened by a sampling mechanism. The inner diameter of the air hole 20 is the outer diameter of the cylindrical collection tube 16. Other opening devices can also be used to open the air hole, which can be stored in the storage chamber 19. The depth of the air hole 20 is 60%-70% of the contamination depth. In actual use, the nozzle of the water vapor pipe is inserted into the deepest part of the air hole 20. After entering the air hole 20, the water vapor diffuses evenly in multiple directions. Since water vapor naturally floats, the total amount of water vapor diffused upward exceeds the total amount of water vapor diffused downward. Setting the depth of the air hole 20 below the midline of the contamination depth ensures relatively uniform water vapor distribution throughout the contamination unit.

[0073] S4: The electrode plates and the heating plate 6 are energized, and at the same time, 100-degree Celsius water vapor is input into the pollution unit through the pores 20. 100-degree Celsius water vapor is relatively easy to obtain, and does not require pressurization or additional heating. It can maintain both the temperature and humidity of the soil. A DC electric field is formed between the anode plate 5 and the cathode plate 4, and the charged pollutants in the pollution unit are enriched on the anode plate 5 or the cathode plate 4; the pore water in the pollution unit flows toward the cathode plate 4 under the action of the DC electric field, and the uncharged pollutants in the pollution unit flow with the pore water to the flow channel 2 where the cathode plate 4 is located; in addition to the above-mentioned electrodialysis and electromigration processes, the DC electric field can also produce electrophoresis and acidic migration bands. Specifically, charged colloidal particles in the soil, including fine soil particles, humus, and microbial cells, migrate under the action of an external electric field. Thus, these colloidal particles and pollutants adsorbed on these particles can be removed. H generated at the anode + , migrate to the cathode under the action of the DC electric field, thus easily forming an acidic migration zone. The formation of the acidic migration zone promotes the desorption and dissolution of heavy metal ions from the soil surface and their migration.

[0074] S5: After the soil remediation of the contaminated area 1 is completed, the electrode plates and pore water in the flow channel 2 are removed, and the charged pollutants enriched on the anode plate 5 and the cathode plate 4, the uncharged pollutants in the pore water, and the contaminated soil produced by trenching and drilling are treated centrally. The volume of this part of contaminated soil is very small compared to the entire contaminated area 1. Even if traditional physical and chemical combined technologies are used for treatment, the cost, energy consumption and time required are relatively small, which has almost no impact on the overall remediation cost and energy consumption, and the chemical residues produced are almost negligible.

[0075] S6: Remove the heating plate 6 and backfill the flow channel 2, the installation groove 3 and the air hole 20 with clean soil. The clean soil can be directly the contaminated soil treated in step S5, or clean soil can be collected from other areas.

[0076] In some embodiments, the distance between adjacent cathode plates 4 and anode plates 5 is 60 cm to 100 cm, the voltage between the cathode plates 4 and anode plates 5 is 30 to 60 V, and the current density is 5 to 8 A / m 3 , the heating temperature of the heating plate 6 is 120-150 degrees Celsius. It should be noted that electrodialysis requires the soil to maintain a certain moisture content to achieve the flow of pore water. Generally speaking, if the temperature of the heating plate 6 is higher than 100 degrees Celsius, it will cause internal water to evaporate and electrodialysis cannot be achieved. However, this application ensures that the soil moisture content is always sufficient by inputting water vapor into the contaminated area 1. Therefore, the temperature of the heating plate 6 of this application can break through the limit and be set above 100 degrees Celsius, thereby greatly improving the volatilization and migration speed of pollutants. This is also the key factor that this application can shorten the repair time to within 24.

[0077] Experimental example

[0078] According to the Technical Guidelines for Soil Remediation of Construction Land issued by China's Ministry of Ecology and Environment and other relevant environmental protection laws and regulations.

[0079] The soil usage standards are as follows:

[0080] Cu content standard: 50mg / kg

[0081] Zn content standard: 200mg / kg

[0082] Cd content standard: 1.0 mg / kg

[0083] Pb content standard: 100mg / kg

[0084] Soil exceeding the above standard content is considered contaminated soil. Different experimental conditions are used below to repair the contaminated area 1 and compare the repair effects.

[0085] Experimental conditions:

[0086] Experimental Group 1

[0087] Heating plate 6 temperature: 120.00℃

[0088] Electrode plate voltage: 30.00V

[0089] Current density: 5.00A / m 3

[0090] The distance between the cathode plate 4 and the anode plate 5 is 100 cm.

[0091] Experimental Group 2

[0092] Heating plate 6 temperature: 120.00℃

[0093] Electrode plate voltage: 40.00V

[0094] Current density: 6.00A / m 3

[0095] The distance between the cathode plate 4 and the anode plate 5 is 100 cm.

[0096] Experimental Group 3

[0097] Heating plate 6 temperature: 140.00℃

[0098] Electrode plate voltage: 40.00V

[0099] Current density: 6.00A / m 3

[0100] The distance between the cathode plate 4 and the anode plate 5 is 100 cm.

[0101] Experimental Group 4

[0102] Heating plate 6 temperature: 140.00℃

[0103] Electrode plate voltage: 40.00V

[0104] Current density: 6.00A / m 3

[0105] The distance between the cathode plate 4 and the anode plate 5 is 80 cm.

[0106] Experimental Group 5

[0107] Heating plate 6 temperature: 150.00℃

[0108] Electrode plate voltage: 60.00V

[0109] Current density: 8.00A / m 3

[0110] The distance between the cathode plate 4 and the anode plate 5 is 60 cm. The repair results are as follows:

[0111] Experimental Group 1:

[0112] Before restoration

[0113] Cu content: 63.56 mg / kg

[0114] Zn content: 240.34 mg / kg Cd content: 2.38 mg / kg

[0115] Pb content: 145.67 mg / kg

[0116] After repair

[0117] Cu content: 49.82mg / kg Zn content: 190.50mg / kg Cd content: 1.02mg / kg Pb content: 98.76mg / kg Removal rate

[0118] Cu removal rate: 21.62% Zn removal rate: 20.71% Cd removal rate: 57.14% Pb removal rate: 32.06%

[0119] Repair time: 23.8h.

[0120] Experimental Group 2

[0121] Before restoration

[0122] Cu content: 67.45mg / kg Zn content: 255.68mg / kg Cd content: 2.89mg / kg Pb content: 155.49mg / kg After restoration

[0123] Cu content: 48.32mg / kg Zn content: 120.45mg / kg Cd content: 0.45mg / kg Pb content: 89.67mg / kg Removal rate

[0124] Cu removal rate: 28.06% Zn removal rate: 52.94% Cd removal rate: 84.43% Pb removal rate: 42.31%

[0125] Repair time: 23.2h.

[0126] Experimental Group 3

[0127] Before restoration

[0128] Cu content: 71.23 mg / kg Zn content: 268.90 mg / kg Cd content: 3.16 mg / kg Pb content: 160.31 mg / kg After restoration

[0129] Cu content: 47.56 mg / kg Zn content: 110.23 mg / kg Cd content: 0.38 mg / kg Pb content: 85.49 mg / kg Removal rate

[0130] Cu removal rate: 33.54% Zn removal rate: 59.01% Cd removal rate: 88.35% Pb removal rate: 46.71%

[0131] Repair time: 22.6h.

[0132] Experimental Group 4

[0133] Before restoration

[0134] Cu content: 75.11 mg / kg Zn content: 278.45 mg / kg Cd content: 3.57 mg / kg Pb content: 165.22 mg / kg After restoration

[0135] Cu content: 46.78 mg / kg Zn content: 100.12 mg / kg Cd content: 0.30 mg / kg Pb content: 80.34 mg / kg Removal rate

[0136] Cu removal rate: 37.16% Zn removal rate: 64.34% Cd removal rate: 91.57% Pb removal rate: 51.43%

[0137] Repair time: 21.9h.

[0138] Experimental group 5 (best repair effect) before repair

[0139] Cu content: 78.94 mg / kg Zn content: 288.76 mg / kg Cd content: 3.98 mg / kg

[0140] Pb content: 170.13 mg / kg

[0141] After repair

[0142] Cu content: 45.95 mg / kg

[0143] Zn content: 90.00 mg / kg

[0144] Cd content: 0.22 mg / kg

[0145] Pb content: 75.65 mg / kg

[0146] Removal rate

[0147] Cu removal rate: 41.70%

[0148] Zn removal rate: 68.77%

[0149] Cd removal rate: 94.47%

[0150] Pb removal rate: 55.56%

[0151] Repair time: 21.1h.

[0152] Data Analysis

[0153] The remediation time for all groups was completed within 24 hours. In the above five sets of data, we can see that even in experimental group 1 with relatively poor remediation effect, the heavy metal content in the remediated soil reached the soil use standard. The remediation effects of group 2, group 3, group 4 and group 5 increased successively, and the heavy metal content in the remediated soil was significantly reduced, and the removal rate was also increased accordingly. This shows that by optimizing the working parameters of the device, the efficiency of soil remediation can be significantly improved, and rapid remediation can be achieved within 24 hours to meet the soil use standard. These data demonstrate the potential and effect of the device disclosed in this embodiment in the field of soil remediation.

[0154] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0155] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A land consolidation and restoration method applied to land resource management, characterized in that: A land consolidation and restoration device for land resource management is used, comprising: An electrode plate, wherein a flow channel (2) is longitudinally opened in the contaminated area (1), and the electrode plate is arranged in the flow channel (2); A heating plate (6), wherein a mounting groove (3) is provided in the contaminated area (1) in a transverse direction, and the heating plate (6) is arranged in the mounting groove (3); A connecting assembly, used for connecting adjacent electrode plates and / or adjacent heating plates (6) in a vertical direction; A trenching machine (15) having a trenching assembly capable of adjusting the trenching depth, the trenching machine (15) being used to open a flow channel (2) and a mounting groove (3) in a contaminated area (1); soil sampling agencies; a storage chamber (19) integrally provided on the trenching machine (15) for storing the electrode plate, the heating plate (6), the power supply and the soil analyzer, wherein the soil analyzer is used to confirm the contamination depth of the contaminated area (1) based on the sample; A pollution unit is defined between the flow channel (2) and the mounting groove (3), and the pollution unit is provided with an air hole (20). The air hole (20) is connected to a water vapor pipeline and inputs water vapor into the pollution unit; The land remediation method includes the following steps: S1: Collect samples in the contaminated area (1) through a soil sampling mechanism, divide the samples into multiple contaminated intervals along the depth direction of the contaminated area (1), and sequentially send the samples of the multiple contaminated intervals into a soil analyzer to confirm the contamination depth of the contaminated area (1); S2: using a trenching machine (15) to open a flow channel (2) and an installation groove (3) in the contaminated area (1) along the longitudinal and transverse directions; the depths of the flow channel (2) and the installation groove (3) correspond to the depth of the contamination; S3: Determine the height of the electrode plate and the heating plate (6) according to the depth of the flow channel (2) and the mounting groove (3); S4: The electrode plate includes a cathode plate (4) and an anode plate (5), and the cathode plate (4) and the anode plate (5) are arranged in different flow channels (2); the cathode plate (4) is located between two adjacent anode plates (5) and the anode plate (5) is arranged in the two outermost flow channels (2); and a heating plate (6) is arranged in the mounting groove (3); S3: A pollution unit is defined between the flow channel (2) and the mounting groove (3), and an air hole (20) is opened in the middle of the pollution unit. The depth of the air hole (20) is 60%-70% of the pollution depth; S4: The electrode plate and the heating plate (6) are energized, and at the same time, 100 degrees Celsius water vapor is input into the pollution unit through the pores (20). A DC electric field is formed between the anode plate (5) and the cathode plate (4), and the charged pollutants in the pollution unit are enriched on the anode plate (5) or the cathode plate (4); the pore water in the pollution unit flows toward the cathode plate (4) under the action of the DC electric field, and the uncharged pollutants in the pollution unit flow with the pore water into the flow channel (2) where the cathode plate (4) is located; the distance between adjacent cathode plates (4) and anode plates (5) is 60 cm, the voltage between the cathode plates (4) and the anode plates (5) is 60 V, and the current density is 8 A / m 2 , the heating temperature of the heating plate (6) is 150 degrees Celsius; S5: After the soil remediation of the contaminated area (1) is completed, the electrode plates and pore water in the flow channel (2) are removed, and the charged pollutants accumulated on the anode plate (5) and the cathode plate (4) and the uncharged pollutants in the pore water are centrally treated; S6: The heating plate (6) is removed, and the flow channel (2), the installation groove (3) and the air hole (20) are backfilled with clean soil. The excavated soil generated in the flow channel (2), the installation groove (3) and the air hole (20) is centrally processed.

2. A land consolidation and restoration method for land resource management according to claim 1, characterized in that: The connection assembly comprises: a clamping member (7) integrally provided on the electrode plate and / or heating plate (6) along the length direction, a clamping slot (8) provided at the bottom of the electrode plate and / or heating plate (6), and the clamping member (7) can be engaged with the clamping slot (8); an integrated board (9), a first electrical connector (10) provided on the side of the electrode plate and / or heating plate (6), a plurality of electrical connection holes (12) provided on the side of the integrated board (9), and when the first electrical connector (10) is inserted into the electrical connection hole (12), the clamping member (7) is connected to the integrated board (9); a second electrical connector ( 11), which is arranged on the integrated board (9) and is used to connect to a power supply; a first electromagnet (13), which is arranged on the side of the electrode plate and / or the heating plate (6) and is spaced apart from the first electrical connector (10); a second electromagnet (14), which is arranged on the side of the integrated board (9), the first electromagnet (13) is connected to the first electrical connector (10), and the second electromagnet (14) is connected to the second electrical connector (11), and when the first electrical connector (10) is inserted into the electrical connection hole (12), the first electromagnet (13) and the second electromagnet (14) are attracted to each other.

3. The land consolidation and restoration method for land resource management according to claim 1, characterized in that: The soil sampling mechanism comprises: a cylindrical collecting tube (16), the cylindrical collecting tube (16) being a cylindrical structure with a lower opening, the lower edge of which having a serrated structure, and the cylindrical collecting tube (16) being provided with sampling holes through the inner and outer surfaces; a rotating motor (17), the output end of the rotating motor (17) being fixedly connected to the top of the cylindrical collecting tube (16); and a cylinder (18), the cylinder (18) being fixedly arranged on the outer side surface of the trenching machine (15), and the output end of the cylinder (18) being fixedly connected to the rotating motor (17).

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